Charles Augustus Ropes Dimon (April 27, 1841 – May 5, 1902) was a volunteer soldier in the Union Army during the American Civil War. Beginning his service as a private in the 8th Regiment of Massachusetts Volunteer Infantry, Dimon rose through the ranks to become a colonel of a US Volunteer Infantry Regiment and was awarded the honorary grade of brevet brigadier general United States Volunteers, by appointment of President Andrew Johnson on January 13, 1866 to rank from March 13, 1865, and confirmation by the U.S. Senate on March 12, 1866. His success was due in part to the sponsorship of Major General Benjamin F. Butler.